Double zeta Talzin

As a general rule, your arena team should be your strongest team. Plus, NS are viable for nearly every area of the game at this point. It wouldn't be a waste. Her unique gives her extra turns, essentially extra speed. A significant amount I may add.

I use a NS squad as well currently working to get level/material for zeta on both but plague gives you tm and then you get the boost for beginning the match and after party heals. So yes, prioritize the lead but it is good so if you can afford it do it